Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

Downloaded From : www.EasyEngineering.net
Forms for Walls 281
large number of hydraulic lines or individual electric cords to get in
the way of workers.
One side of each pair of forms is suspended from a trolley system,
so workers can retract and easily reset the forms. Plumbing and leveling
of the forms is accomplished by adjusting screw legs on the form
support brackets. There is ample space for workers to operate and no
masts or similar obstructions to hinder concrete placement. Crew
members have a heightened sense of security, so productivity does
not suffer as the core’s height increases.
The top platform of the Self-Climber can be designed to store
tools and building materials, such as reinforcing steel and conduit.
The top platform also offers protection from the rain. In the winter
the entire system can be enclosed and equipped with heaters, so
forming can continue during adverse weather.
ww.EasyEngineering.n
Insulating Concrete Forms
Insulating concrete forms (ICF) are units of rigid plastic foam that hold
concrete in place until it is cured. The units are assembled, stacked, and
then filled with reinforced concrete. The units are lightweight and easy
to erect. Bracing and alignment systems are provided by most manufacturers
of ICFs. This forming system can be used for beams, columns,
or walls. Unlike conventional formwork, the insulating concrete–
forming units are left in place, which results in high energy efficiency.
Wall can be constructed up to 10 feet high using ICFs. Walls constructed
with ICFs can decrease the required capacity of heat-and-air
equipment by 50%, compared to traditional wood-framed walls. The
units provide backing for interior and exterior finishes. Gypsum wall
board may be attached directly to the inside of the wall form. The
exterior of the wall may be finished with tongue-and-groove siding,
cedar shingles, or brick veneer.
The insulating foam is made from expanded polystyrene or
extruded polystyrene material. The three basic form types are hollow
foam block, foam planks held together by plastic ties, and panels with
integral foam and plastic ties.
Block units are the smallest, typically 8 in. thick, 1 ft high, and
4 ft long. They are molded with special edges that interconnect
the blocks. The connections may be tongue-and groove, interlocking
teeth, or raised squares. Plank units range in sizes from 1 by 4 ft
to 1 by 8 ft and are connected by nonfoam material. The long faces
of foam are shipped as separate pieces, which resemble wooden
planks. The planks are equipped with crosspieces as part of the
wall-setting sequence. Panel units are the largest, with sizes up to
4 by 12 ft. Their foam edges are flat and panels are interconnected
by nonfoam fasteners. The panels are connected with integral foam
or plastic ties.
Downloaded From : www.EasyEngineering.net